Thread-laying mechanism for sewing machines



D- S. SEYMOUR.

THREAD LAYING MECHANISM FOR SEWING MACHINES. APPLICATION FILED MAR-10. 1916.

1,411,891. Patented Apr.4,1922.

4 SHEETS-SHEET I.

D- S. SEYMOUR. I

THREAD LAYING MECHANISM FORSEWING MACHINES.

APPLlCATION FILED MAR. 10, I916.

1,41 1,891 Patented p 4, 1922.

4 SHEETSSHEET 2- amen 0 0 (XL/pu JWMJ W Y D. S. SEYMOUR.

THREAD LAYING MECHANISM For; SEWING MACHINES.

- APPUCATION FILED MAR-10, 1916- I I 1,41 1,891 Patented Apr. 4, 1922.

4 SHEETS-SHEET 3.

un/knew S. SEYMOUR,

THREAD LAYING MECHANISM FOR SEWlNG MACHINES.

APPLlCATlQN FILED MAR. 10, 191B.

UNITED STATES PATENT OFFICE.

DUDLEY s. SEYMOUR, or OAK PARK, iim'inois, Assis ioniro'iinion srEciAL MACHINE COMPANY, OF CHICAGO, inLIivoIsA oonrona'rionor ILLINOIS.

THREAD-LAYING ivrnciianis vr son SEWING MACHINES.

Specification of Letters Patent.

Patented Apr. 4:, 1522.

Application filed March 10, 1916; Serial No. "83,300.

To all whom it may concern:

Be it known that I, DUDLEYS. SEYMOUR, a citizen of the United States,- residing at Oak Park, in the county of Cook, State of Illinois, have invented certain new and use ful Improvements in Thread-Laying Mech anism for Sewinghlachincs, of which the following is a description, reference being had to the accompanying drawing and to the figures of reference marked thereon.

The invention relates to new and useful improvements in sewing machines, and more particularly to the thread laying mechanism which lays the thread back and forth in front of the needle or needles so that said thread is secured to the upper face of the fabric by the stitching threads.

An object of the invention is to provide a thread laying mechanism wherein the supporting arm for the thread engaging device is located beneath the supporting head for the needle bar and is mounted on an osc.il lating support extending into the head so that the train of mechanism for operating the support for the arm carrying the thread engaging member may be completely housed within the needle head.

, A further object of the invention is to provide an operating mechanism of the: above character for the thread engaging member wherein the oscillating support for the arm which carries the thread engaging member is actuated from the shaft which reciprocates the needle bar.

These and other objects will in part be obvious and will in part be hereinafter more fully disclosed.

In the drawings, which show by way of illustration, one embodiment of the inventi.on:

Figure 1 isa view, partly in section and partly in side elevation, showing a portion of a sewing machine having the improve-- ments applied thereto;

Fig. Qis a vertical sectional view through the forward end of the overhanging arm and the supporting head carried thereby;

.Fig'. ,3 is a view. partly in section and partly in plan, showing the presser foot, the presser bar, the thread laying devices and the. trimming blades;

H Fig. 4 is a detail in front elevation showing the-needles and the thread layingdevices;

Fig. 5

of- Fig. l;

porting arm. Said sewingmachin'e also an overhanging arm carrying a supporting head 2 at head is needle bar shown, carries; a pair of needles 4 and a pair a horizontal sectional view through the lower end of the'head and above the lower supporting bearing for the presser bar;' f :c

Fig, 6 isxasectional view on the line 6'6 "Fig. 7 is a sectional of Fig. 1 c v a Fig. S is a sectional viewon theline 8-8 of Fig. 7; V

Fig. 9 is a detail, partly in section, show view on the line 7-7 ing the presser bar, the supportingshaft-for the movable trimming blade, and the connecting arm which holds the presser bar t me-oscillating, and a portion of the tension spring which operates npon'the pressei' ham.

Figllll, is a diagrammaticview on an on large d scale showing two fabric sections. the threads joining the same on the upper the needles, the fixed thread guide, and the cooperating hooks, said hooks being outflo f engagement with the cross threads; and

Fig. 11 is a sim lar View; but showing the .liooks moved forward and the cross threads formed into loops toreceive the respective needles. I v The improved thread laying mechanism is shown as applied to a sewing machine consisting of a work support 1, which is preferably in the form ofa cylindrical work suphas I its outer end. Thissupporting head is formed with a chamber which is :closed by a cover plate 2*, thus forming an enclosed supporting head at the free end of the arm.' Reciprocating in said supporting 3 which. as herein of needles 5. Cooperating with the pair of needles {i -4 beneath the work support is 'a looper 6, and cooperating with the needles 5-5 beneath the work support is a looper '7. Mounted in suitable hearings in the overhanging arm is a shaft 8 which proliect s into the supporting head 2. Said shaft is provided with an arm 9 which is connected by a link 10to a collar 11 fixed to the needle bar so that, as the shaft 8 oscillates, the needle bar3 will be recipro'cated.

The material is held on the work support 1 by a presser foot 12.. Said presser foot is carried by a presser bar 13 which is mounted inghead In rear ofthe presser bar 13 face,

rear en is a vertical shaft .14 which is mounted in bearin '15 and 16 projecting rearwardly from e supporting head 2. This shaft 14 is provided with an arm 17 at its lower end, and the arm 17 carries a trimmer blade 18.

' This trimmer blade 18 moves in a horizontal plane andcooperates with a fixed blade'li) whiizh is clamped to the presser foot. The presser foot 12 is formed with a slot 20 which receives the upturned edges of the two fabric sections to be joined and the trinr ming device trims ofl' these' edges, after which they are abutted. The presser foot is provided'with a needle slot 21 which receives the needles 4-4,and said presser foot has a stitch tongue 22 which projects into said slot between the needles. The presser foot also has a second needle 'slot 23 for the i which are connected by the stitching mechanism includingmy improved thread laying devices. The ed 'es of these, fabric sections areabutted at The needles 4-4 are preferably so positioned that the left hand needle is nearer the meeting edges of the fabric sections than the right hand needle, while the pair of needles 5--5 is positioned so that the right hand needle is nearer, the meeting edges of the fabric sections. The needles 4-4 carry threads a-a while the needles 5-5 carry threads b--'-b. The thread hook 25 operates upon a cross thread 0, while the thread hook 26 operates upon a cross thread (13. Thecross threads 0 and d are led respectively through guide eyes 32 and 33 which are, formed in an arm 34 fixed to the supporting head 2. This thread guiding arm 34 has no movement but is fixed relative to the needles so as to cooperate with the thread hooks "in properly positioning the I cross threads for engagement with the needle WInf Fi lO'the threadhooksare at the p of their i stroke, and their" hook and; 27 are adjacent the thread guidingeyes 32 and 33 respectively. As the hooks move forward they willengage their respective cross threads and carry the same tothe.

position indicated in Fig. 11. The strand of. cross thread running from the-notched end of thethread hook to the supply passes between the needles] of the respectivepair with which it cooperates, while the strand of the crossthrea'd running from thehook thread lglencath the material. forms no part oi my present invention, but

this will in turn oscillate the threald hooks to the fabric passes in rear of both needles.

- The result is that. a loop is formed in the cross thread for the leit hand needle, while the cross thread is carried around the right hand needle, by, he feedof the fabric and the next following stroke of the thread hook. This lays the cross thread back and forth and around each needle puncture. The cross thread 0 overlies the crossihread d and the needle threads 5 at the right of the seam and. both cross threads extend across the meeting edges of the fabric. t is understood that the needle loops of each respectire pair of needles are connected beneath the material by a looper thread so that the meeting;- edges are crossed by the 'looper Th s seam hasbeen described in detail in order that the operation oi? the thread laying devices may he better understood.

The sleere29 surrou1'1dsthe presser bar 13 and n'ioilntcd in the lower vbearing 35 fez-said prcsser liar. The sleeve is formed with a shoulder lfi'which rests onthe upper 108 oi? the bearing and the arm 28 is provided with a collar clamped to the lower end of thissleevc by the set-screw 30,.as

above noted. This collar prevents the sleeve 29 from rooting u wardly. y i

The shaft 8 is provided with a second arm, 37 which connected to a rock lever 38 by a link 39; This rock leveris mounted by a supporting stud 42. Thebearin 41 "is preferably. integral with the stud, w ile the conchearing 40 is adjustable thereon and is held in place by a nut 43. The stud 42extcnds through a lug 44't'ormed integral with the overhanging arm and is clamped in position by a nut 45." The rock lever 38 has an upwardly extending arm 46 to which the link -39 is pivoted, and also a downon cone bearings 40 and 41 which are carried wardly eXten dingarm-47 A link 48 isconnected atone end to a ball stud 49' carried by this arm 47, while the other end of the link 48 isronnected to a ball stud 5O onan arm 51 tormed integral with the sleeve 29. As the needle shaft 8 oscillates, it will not only reciprocate the needle bar-through the oscillationlof the arm '9, 'butlthrough the oscillation of the arm 37. and the rock 1 m 38. the sleeve 29 will also bdoseillated and 25 and 26. v p Fixed to the upper end pf thesleeve 29 is an. eccentric 52. An eccentric strap 53 cooperates withsaid eccentric, and said strap is connected to a ballistud54carried by an arm 55 attached to the shaft 14. The Oscil? lation otthe sleeve 29 will; there' fore, oscillatethe shaft 14, and this in turnj'willoscih late the trimmer blade 18. The shaft 14 is moved ,endwise by a spring 56 whichbears at its lower'end against the arm 17 and at its upper end against a washer 5i seated in a recess 55% at the lower face of the bearing 15. The presser bar 13 is provided with an arm 59 which projects rearwardly, and the shaft 'l-lfreely extends tl'irough this bar. This prevents the presser bar from oscillat' ing through. the .i rain of the cutting action.

Said arm 59 has an annular recess inits upper face adapted to receive an inverted cup 60. A spring 61 surrounding the shaft 14 rests upon the upper face of the cup 60, and the upper end of this spring bears upon the threaded sleeve 62 which is threaded in the upper bearii'lg it, and the threaded sleeve becomes the bearing sleeve for the shaft 14; which may not only oscillate in said bearing sleeve but may be freely moved endwisc therein. The purpose of this spring 61 is to vieldingly force the presser bar downwardly and. hold the presser foot on the work support.

From the above description, it will be apparent that I have provided a thread laying mechanism wherein the thread hooks are positively operated from the same train of mechanism which reciprocates the needle bar and the operating devices for the thread manipulating members are disposed within the supporting head at the forward end of the overhanging arm. This not only affords an efiicient housing for the operating parts, but will provide a direct short train of mechanism which is substantially free from undesirable vibrations in the rapid movements of the parts.

It is obvious that minor changes in the details of construction and the arrangement of parts may be made without departing from the spirit of the invention as set forth in the appended claims.

Having thus described the invention, what is claimed as new is 1. A sewing machine including in combination, a work support an overhanging arm, a supporting head at the free end of said overhanging arm, a needle bar operat ing shaft in said overhanging arm projecting into said supporting head, a needle bar mounted in said supporting head, means for reciprocating said needle bar from said shaft, two needles carried by said needle bar, a thread hook cooperating with the needles, a stationary thread guide for said thread hook, a member mounted in said supporting head to oscillate about a vertical axis and carrying said thread hook, a rock lever mounted in said supporting head and oscillating about a horizontal axis, a link connecting said rock lever to said oscillating member, and means for oscillating said rock lever from said needle bar operating shaft.

2. A sewing machine including in combination, a work support, an overhanging arm, a supporting head at the free end of said overhanging; arm, a needle bar operating Shaft in said overhanging arm projecting into said supporting head, a needle bar mounted in said supporting headtwo needles carried by said needle bar, means for reciproeating said needle bar from said shaft, a thread hook cooperating with the needles, a stationary thread guide for said thread hook, a member mounted in said supporting head to oscillate about a vertical axis and carrying said thread hook, a rock lever mounted in said supporting head and oscillating about a horizontal axis, a link connecting said rock lever to said oscillating member, means for oscillating said rock lever from said needle bar operating shaft, a supporting stud carried by the overhanging arm, and cone bearings mounted on said supporting stud on which said rock lever oscillates.

in testimony whereof, I aflix my signature in the presence of two witnesses.

DUDLEY S. SEYMOUR.

Witnesses:

S. GEORGE TATE, STEDMAN THOMAS. 

